John's favorite book is Harry Potter.(对划线部分提问）划线部分是Harry Potter.

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John's favorite book is Harry Potter.(对划线部分提问）划线部分是Harry Potter.
John's favorite book is Harry Potter.(对划线部分提问）划线部分是Harry Potter.

John's favorite book is Harry Potter.(对划线部分提问）划线部分是Harry Potter.
What's John's favorite book

What's John's favorite book？